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United States Patent | 5,299,549 |
Schatz | April 5, 1994 |
In a method of controlling the fuel-air ratio of an internal combustion engine the combustion chamber and its contents are preheated at times when the engine is started from cold and during other operative conditions of thermal energy deficiency. The engine is operated with a lean fuel-air mixture from the very beginning when the engine is started, and the fuel-air ratio is controlled exclusively by oxygen sensor means in the exhaust gas.
Inventors: | Schatz; Oskar (Waldpromenade 16, D-8035 Gauting, DE) |
Appl. No.: | 990902 |
Filed: | December 15, 1992 |
Dec 16, 1991[DE] | 4141481 |
Current U.S. Class: | 123/672 |
Intern'l Class: | F02D 041/06; F02D 041/14 |
Field of Search: | 123/21,64,52 MF,90.11,316,337,376,378,403,672,673,674,697 |
4231335 | Nov., 1980 | Hallberg et al. | 123/701. |
4426972 | Jan., 1984 | Kimura et al. | 123/378. |
4467601 | Aug., 1984 | Watanabe | 123/376. |
4641613 | Feb., 1987 | Delesalle | 123/64. |
4655182 | Apr., 1987 | Nakano et al. | 123/697. |
4721088 | Jan., 1988 | Mieno et al. | 123/697. |
4771752 | Sep., 1988 | Nishimura et al. | 123/672. |
4802452 | Feb., 1989 | Kanesaka | 123/316. |
4945870 | Aug., 1990 | Richeson | 123/64. |
4958606 | Sep., 1990 | Hitomi et al. | 123/316. |
5074268 | Dec., 1991 | Schatz et al. | 123/403. |
5080064 | Jan., 1992 | Buslepp et al. | 123/674. |
Foreign Patent Documents | |||
3729771 | Mar., 1989 | DE. | |
2469569 | May., 1981 | FR. |